Two causes of hypoparathyroidism?

Carcinoid syndrome:

rare syndrome caused by carcinoid tumors (neuroendocrine cells), especially
those of the -?-small bowel;
the tumors secrete high levels of serotonin (
-?-5-HT) that does not get
metabolized by the liver due to liver metastases; results in recurrent
diarrhea, cutaneous flushing, asthmatic wheezing, and
-?-right-sided valvular
disease; most common tumor of
-?-appendix; ↑ 5-HIAA in urine.